Tonka is 8 years old and weighs approximately 45 lbs. He shows aggression/dominance/ guarding issues. He has bit/scratched with his teeth 4 times while in my care. I rescued him from euthanization because I know the previous owner who asked me to help the dog. I do not know his complete history. The previous owner got him as a puppy. Tonka needs someone who knows 'how' to help him.